Air-strainer.



E. H. DEWSON.

AIR STRAINER.

APPLICATION FILED AUG .3,191Z

Patented Mar. 9, 1915.

INVENTOR WITNESSES v SYLVANIA.

AIR-$TRAINER.

EDWARD H. DJEWSON, or NEW roan, 1a. 1a., assrenon T0" re n wnsrrnerrousa are." BRAKE COMPANY, or wrnivrnazomc, PENNSYLVANIA, A. conronarron' ,or rnnn- Specification of Letters Patent.

Patented Mar. 2, 1915.

Application filed August 3, 1912. Serial No. 713,089.

T all whom it may concern:

Be it known that l[, EDWARD H. Dawson, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented new and useful Improvements in Air-Strainers, of which the following is a specification.

This invention relates to suction strainers for air compressors, and more particularly to a strainerfor removing dirt and moisture from the air supplied to air com-' pressors on railway cars.

v The principal object of my lnvent on is to provide an improved strainer of'the above character;

In the-accompanying drawing, Figure 1 is a transverse sectional view of the improved air strainer applied to the cylinder head of an air compressor; Fig. 2 a longitudinal sectional view thereof; Fig. 3 an end view;

and Fig. 4 a horizontal sectional view thereof.

The strainer body 1 is preferably constructed of sheet steel bent in the form of a tank with the bottom side rounded and having sheet steel end members 2 adapted to fit into the open ends of the body and se- Suction brackets cured thereto by rivets. 3 are secured to the body 1 on one side near the end members 2-and said brackets are each provided with a passage ileading to a pipe 5 which communicates with chamber 6 in suction valve casing 7, the construction shown being adapted for a two cylinder compressor. Near the top of the side portion of the body is an aperture 8 adapted to communicate with the passagesin each suction bracket 3. Within the body 1 is arranged a bafiie wall 9 which is preferably 'an integral part of said body and adapted to be formed in the operation of bending the body portion to shape. The lower portion of the wall 9 is bent outwardly toward a side wall of the body and said wall is provided with flanges 10 for securing the wall to the end *members' 2. At the bend in the wall 9 is secured a-baliie plate 11 diverging toward the opposite side wall. Lengthwise of the casing and adjacent to the lower longitudinal edge of the wall 9 is secured a member 12, preferably comprising a section of angle iron having its lower flange dipping into the oil layer 21 and its upper flange forming a baffle plate, so that fluid is required to pass over the upper edge of the angle iron and through the longitudinal-passag'eway formed between said angle iron and the lower portionof the wall 9,

and thence around the lower longitudinal edge of the wall 9, as shown by the arrows in Fig; 1. An inwardly flaring strip 13 issecured to the side wall of the body 1 adjaplate 11 to cent to the lower extremity of assist in dlrecting the current of air. I

Opening into the upper end portions of chamber lt-formed by wall 9 and plate 11 and one side wall of the-body are apertures 15 through which atmospheric air is taken into the strainer. The aperture 15 may be protected by sheet steel heads 16 secured in pos1t1on adjacent to said apertures. The lower portion of the end members 2 may consist of castings 17 having cap plugs 18 screwed therein, so that by removing said plugs the strainer may be inspected and cleaned.- The suction valve casing 7 is shown as a part of cylinder head 19 of the compressor cylinder 20.

In use, a quantity of oil or other liquid is placed within the strainer so as to form a layer 21, the surface of which is below.

11. The angle member 12, however, is arranged to have its lower edge immersed in the 011. When the compressor 1s running,

atmospheric air is taken in at the inlets l5 and flows from chamber let through the opening'formed by plate 11 and strip 13. The air then impinges on the surface of the oil depositing dirt therein in the oil. The air is now obliged to flow around the upper edge of the angle 12 through the opening formedbetween the wall 9 and said angle, as the lower edge of the angle is immersed in the oil bath. The air flow is thus caused to impinge on the oil surface a second time before finally passing to chamber 22 and out through the apertures 8 to the suction inlets of the compressor.

It will now be clear that the provision of the diverging partition wall causes-the air to impinge twice on the oil bath and while a more thorough cleaning of the air is thus effected, the large volume arrangement provided by this construction and the large inlets which may be employed prevent any substantial restriction of the compressor suc-. tion.

Heretofore, the crank case chamber of the usual fluid compressor has been provided with an atmospheric vent, so as to per- :nit of a to and fro movement of the air con- Fined within said chamber due to the movement of the compressor pistons. In the 5 movement of air from the atmosphere into the crank case chamber more or less dirt is drawn in with the air, which is, of course, undesirable and in order to prevent this I conneot the crank case vent with the purified air chamber of the strainer. As shown in the drawing, the Vent passage 25, leading to the crank case chamber is connected by a pipe 26to an inlet 27 opening into the purified air chamber 22 of the strainer.

I claim as new and desire to secure by Letters Patent, is:--

1. An air strainer comprising a casing, a partition forming two chambers in the casing, an atmospheric inlet to one chamber, an

' outlet from the other chamber, a layer of liquid in the bottom of said casing, diverging members on said partition having their lower edges in close proximity to the surface of the liquid and an intermediate deflecting member secured to one of the di- Having now described my invention, what 'verging members and having its lower edge immersed in the liquid, to thereby direct the flow of air against the surface of the liquid first around one diverging member and then around the other.

2. air strainer comprising a casing, a layer of oil in said casing, a partition dividing the casing into two chambers and provided with downwardly diverging portions thelower edges of which are in close proximity to the surface of the oil, an at- .mospheric air inlet to one chamber, an. air

outlet from the other chamber, and .a bafiie plate carried by one of the diverging portions and arranged intermediate said downwardly diverging portions and having its lower edge immersed in the oil, to thereby direct the current of air over the upper free edge thereof.

In testimony whereof I have hereunto set my hand.

EDWARD H. DEWSON.

-S. W. KEEFER 

